KR830000747Y1 - Tape cassette - Google Patents

Abstract

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Description

Tape cassette

1 is a plan view showing a conventional tape cassette for a VTR by breaking a portion thereof.

2 to 4 show an embodiment in which the present application is applied to a tape cassette for a VTR.

2 is a plan view of the main portion of the tape cassette from which the upper cassette tape is removed.

3 is a perspective view of the main portion of the tape cassette.

4 is a front view of the elastic film.

The present application relates to a tape cassette such as a VTR, a tape recorder, and the like, wherein a tape wound on both sides of a supply rail and a winding rail in a cassette box is pulled out of the cassette box and used. will be.

As is well known, tape cassettes of this kind in VTRs, etc., have both ends attached to a pair of rails of supply and winding stored in the cassette box body, and a part of the magnetic tape recommended for them is placed on the front of the cassette. It is used after it has been pulled out of the cassette box in advance. In addition, since both rails can be freely rotated in the cassette box, there is a problem that the tape is likely to loosen at the edge of the front opening due to vibration during cassette handling. The relaxation of a person causes a number of irrationalities. That is, the tape of the loose part is damaged, or the cassette mounting operation on the back is disturbed, or the tape is damaged. This is the first cause of deterioration of reproduction characteristics.

Therefore, conventionally, a tape car set such as a cassette-type VTR or a tape recorder has adopted a means for preventing the tape from loosening at the front opening of the cassette during tape driving stop.

An example of such a means will be described. In the tape cassette used for the cassette-type VTR, as shown in FIG. 1, a pair of feeds into the cassette box 1 including a pair of upper and lower cassette lowers 1a and 1b. And winding tapes 2 and 3 are housed, and magnetic tapes 4 are recommended with both ends attached to these rails 2 and 3. The magnetic tape 4 drawn out from the supply rail 2 is, for example, a low friction member 6 attached to the free end of the elastic film 5 made of a flexible synthetic resin, and a lower half of the cassette. 1b is inserted by the wall portion 7 to receive a predetermined back tension, and passes between the pair of guide pins 8 and 9 to form a recess on the front side of the cassette box 1. It is guided by the guide pin 11 through the (10) 10, and it reaches to the take-up rail 3. In addition, although not shown, the elastic film similar to the elastic film 5 is provided in the winding rail 3 side (the tape run downstream from the guide pin 11), and the magnetic tape 4 is this elastic film 5 It is made to slide between them in the state fitted by the low friction member attached to the free end of the cassette, and the wall part of the cassette lower half. As a result, even if the supply and take-up rails 2 and 3 are unexpectedly rotated by vibration or the like and the magnetic tape 4 is released, the low friction members 6 on the supply and take-up rails 2 and 3 side, respectively. ) And the clamping force between the wall portion 7 of the lower half of the cassette, the magnetic tape 4 most impregnated at the front opening 12 is always in a tension state (ie, not loosened). Is placed. In addition, the magnetic tape 4 is held at a predetermined position by the low friction member 14 attached to the tip of the other elastic film 13 when crossing the recessed portion 10 on the front side.

In such a conventional tape cassette, a pair of elastic films (5) and (13) are attached to the cassette lower half (1b) of the cassette box (1) separately through a double-sided adhesive agent (15). More assembly work and poor working efficiency. In addition, since the ballistic film 5 must be bent in the pressing part, the number of air-flows also increased by this, and the cost of the tape cassette became expensive. Moreover, there existed a defect that the double-sided adhesive material 15 peeled easily from the cassette box 1 by the change with time. Moreover, it was very difficult to automate the adhesion of the elastic film 5.

Therefore, a tape cassette is proposed in which an elastic film is mounted on a cassette box by mechanical means. For example, a conventional method for compressing an elastic film by mechanical means is to mount an elastic film on the lower half of the cassette, and then cover the upper half of the cassette, and to prevent the upper and lower sides of the elastic film from being formed by the protrusion formed thereon. In this mounting method, however, if the elastic film is attached to the lower half of the cassette and abnormal vibration is applied to the lower half of the cassette during the operation until the upper half of the cassette is covered, or if the elastic film is contacted when the other parts are incorporated, the position is changed. It goes off. Therefore, assembling work requires careful attention, and the workability is bad, and there is a defect that an unexpected accident such as damage to the tape holding piece occurs when the cassette top is put on without knowing that the position of the tape holding piece is shifted. In addition, for this type of tape cassette, the cassette box body is assembled and transported without inserting the tape, which is disassembled in the upper and lower half of the cassette, and then flows to the manufacturing line of the tape cassette to incorporate the tape. It is necessary to reliably fix the elastic film for preventing relaxation and the elastic film for tape pressing by only one cassette half without being restrained by the other cassette half. That is, in the tape cassette configured to fix these elastic films by pressing the other cassette half, there is a possibility that the elastic film may peel off when dismantling to the upper and lower half of the cassette.

The present application has been devised in view of the above circumstances, in the tape cassette described at the outset, the first elastic film for imparting a predetermined back tension to the tape drawn out from the supply rail, and the front surface of the cassette box body. A second elastic film for holding the tape passing through the recessed portion at the predetermined position is integrated, and a long hole is provided at or near the central portion of the unified elastic film, and the projection and fitting integrated with the long hole are integrated. The present invention relates to a tape cassette formed by providing a projection for fixing an elastic film on a cassette upper half or a cassette lower half of the cassette box.

By configuring in this way, the number of parts of the tape cassette can be reduced, so that the assembly labor can be reduced and the cost of the tape cassette can be greatly reduced. In addition, since the elastic film is fixed by mechanical means, there is no adverse effect due to changes over time, and furthermore, since only one side of the upper half or the lower half of the cassette can be reliably fixed to the elastic film, there is a risk of causing any trouble when dismantling the tape cassette. There is no.

Next, an embodiment of the present application will be described with reference to FIGS. 2 to 4.

As shown in FIG. 2 and FIG. 3, the V-shaped recessed part 17 is formed in the cassette lower half part 16b of the cassette box 16 of this embodiment, and this V-shaped recessed part 17 is formed. The front wall 18, which stands upright, is integrally provided at the leading edge of the cassette lower half 16b. The pressure wall portion 18 is bent in a V shape in accordance with the recessed portion 17. In FIGS. 2 and 3 of the front wall portion 18, the F-shaped elastic film support wall portion 21 is roughly formed at the right end of the cross section in which the protrusions 20 are integrally formed. This support wall portion 21 is arranged in parallel with the front edge of the cassette box body 16, as shown in FIG. In the cassette lower half portion 16b of the cassette box body 16, an elastic film support wall portion 22 opposite to the support wall portion 21 is integrally provided. In addition, the protrusions 24 and 25 which protrude toward the other support wall part 21 are integrally provided in the left end part and the middle part of this support wall part 22, respectively. In addition, as shown in FIG. 3, in order to facilitate the mounting of the elastic film 27, the upper ends of the projections 20, 24, 25 are cut out to face the support members 21, 22, respectively. ), The inclined surfaces 20a, 24a, 25a are formed, respectively. In addition, in order to improve the moldability of the lower half by avoiding the undercut shape, the notch 16c is formed in the lower portion of the cassette 24 at the lower half of the cassette 16b.

And the elastic film 27 which consists of polyester etc. is attached to the cassette lower half part 16b in the state by which the center part was fixedly fixed between the said support wall parts 21 and 22. As shown in FIG. That is, in the horizontally flat flat elastic film 27, as shown in FIG. 4, a longitudinal rectangular hole 28 is formed, and the right end of the front wall 18 is formed. The projection 24 of the support member 22 fits into the long hole 28 between the corner portion 18a and the projection 20 of the support member 21. Between the protrusions 24 and 25 of the support member 22, the protrusion 20 of the support member 21 enters a little bit as shown in FIG. 2, whereby the elastic film 27 is supported. The projection 24 is reliably fitted into the long hole 28 by being pressed against the wall portion 22 side. Therefore, the elastic film 27 is attached to the cassette lower half portion 16b in a state where movement in the vertical and horizontal directions is completely blocked.

In addition, mounting of the elastic film 27 to the cassette lower half 16b inserts the elastic film 27 between the support wall portions 21 and 22 from the upper side of the cassette lower half 16b, thereby lowering the elastic film 27. The support wall portion 22 to the long hole 28 by inserting the elastic film 27 elastically by pushing it further downward while sliding on the inclined surfaces 20a, 24a and 25a of the projections 20, 24 and 25. What is necessary is just to fit the protrusion 24 of (). In this case, the elastic film 27 is deformed into an arch by the protrusions 24, but since the elastic film 27 can be sufficiently deformed by the elasticity of the elastic film 27, it is not broken.

In addition, both ends of the elastic film 27 are free, and low friction members 30 and 31 made of a tapered sheet containing carbon with relatively low friction and antistatic effect are fixed. . The low friction member 30 on one side faces the tip of the wall portion 33 integrally formed on the lower half of the cassette 16b of the cassette box 16, and the low friction member 30 and the wall portion 33 The magnetic tape 35 is sandwiched by the. That is, the elastic film 27 on the side to which the low friction member 30 is fixed is resistant to elasticity between the end portion 21a of the support wall portion 21 and the wall portion 33 as shown in FIG. It is bent so that it may always give a certain suitable back tension to the magnetic tape 35, and prevents the magnetic tape 35 from loosening. The other low friction member 31 is in contact with the inner surface of the magnetic tape 35 so that the magnetic tape 35 is always fixed to the magnetic tape 35 by a constant moderate elastic force. It is pressed in the direction toward the outer side from the front part. That is, the elastic film 27 on the side to which the low friction member 31 is fixed has a front end of each portion 18a of the support wall portion 21 and a contact portion between the magnetic tape 35 and the low friction member 31. It is bent against elasticity, and the magnetic tape 35 is thereby maintained at a constant distance with respect to the front wall portion 18 of the cassette box 16, thereby forming a V-shaped recess 17 of the cassette box body. The tape-in-line pin is allowed to enter inside the magnetic tape 35, while the magnetic tape 26 crossing the V-shaped recess 17 has two guide pins 37 and 38 on the right side. It is guided by the guide pin 39 on the left side after passing through.

According to the tape cassette 15 configured in this way, an elastic film (low friction member (1) is applied to the magnetic tape 35 to impart a predetermined back tension to prevent the magnetic tape 35 from relaxing on the recessed portion 17 on the front side. 30) side and the elastic film (low friction member 31 side) holding the magnetic tape 35 passing through the recessed portion 17 at a predetermined position are integrated into one elastic film 27. In addition, the number of parts can be reduced, and the assembly work can be reduced since the mounting of the elastic film 27 is completed once. In addition, since the elastic film 27 is attached to the cassette lower half 16b by mechanical means, the assembly work can be automated and less adversely affected by changes over time. In addition, since the elastic film 27 can be reliably fixed only by the cassette lower half 16b, even when transported as a part of assembly, no trouble is caused. In addition, since the conventional tape pressing member attaches the angle to the component itself, it is easy to change the angle due to creep. However, the elastic film 27 of the present example has a straight shape and a structure which gives the angle by the cassette lower half 16b. As we did, there is not appropriate of creep.

Although the present application has been described based on the examples, the present application is not limited by the above embodiments, and various modifications are possible based on the technical spirit of the present application. For example, the present application can be applied to tape cassettes other than VTR. In the above-described embodiment, the elastic film 27 is mounted on the cassette lower half 16b, but it may be mounted on the cassette upper half.

As described above, the present application integrates the elastic film for applying the back tension and the carbon film for holding the tape, installs a long hole in the central portion or the vicinity of the unified elastic film, and the projections fitting the long hole. Since the projection for fixing the elastic film is provided at the upper half or the lower half of the cassette box body, the number of parts and the number of assembly parts of the tape cassette can be reduced, thereby greatly reducing the cost of the tape cassette. In addition, since the elastic film is fixed by mechanical means, there is no adverse effect due to changes over time. Moreover, since only one of the upper half of the cassette or the lower half of the cassette can be reliably fixed, the elastic upper film can be reliably fixed. It does not cause any trouble at the time of disassembly. In addition, since the mounting of the elastic film is very easy, the assembly operation of the tape cassette can be automated.

Claims (1)

In the tape cassette which draws out the tape wound by using the tape wound in the state which both ends were attached to the supply rail and the winding rail in a cassette box body as shown in the figure and mentioned above in the main body, And a first elastic film for imparting a predetermined back tension to the tape drawn out from the supply rail, and a second for holding the tape passing through the recessed portion on the front side of the cassette box body at a predetermined position. The elastic film is integrated, and the long hole 28 is provided in the center part or the vicinity of the integrated elastic film 27, and the projection 24 fitted in the long hole 28 and the integrated elastic film 27 are integrated. A tape cassette formed by providing a fixing projection (20, 25) on the upper half or the lower half of the cassette box.